Speed governor for fuel injection pumps

Abstract

A speed governor for fuel injection pumps of internal combustion engines that has a centrifugal adjuster that acts counter to the force of governor springs to generate a speed-dependent adjustment travel of a governor sleeve and that acts on a fuel quantity adjusting device of a fuel injection pump via the governor sleeve and a governor lever disposed thereupon In this process a charge-pressure-dependently adjustable stop for a full-load fuel supply quantity, which is disposed on a stop lever is pivoted as a function of temperature and speed into the adjustment path of a counter stop disposed on the fuel quantity adjusting device, in such a way that, after a certain speed and a certain operating temperature of the engine has been reached, the stop comes into contact with this counter stop of the fuel quantity adjusting device. For this purpose the stop lever has two lever arms, and a temperature-dependently controlled governor member which acts on the first lever arm, and a speed-dependently-controlled control lever which acts in the same direction of rotation on the second lever arm.

What is claimed and desired to be secured by Letters Patent of the United States is: 
     
       1. A speed governor for fuel injection pumps of internal combustion engines, having a governor sleeve (13) that is adjustable counter to a restoring force of a speed-dependent force of a speed governor (1) of the fuel injection pump, by means of which sleeve a governor lever (15) connected to a fuel quantity adjusting device is actuatable; a stop (39) is disposed on a stop lever (33) for limiting the quantity of injected fuel, the stop is adjustable about a bolt (43) in a direction of motion of the fuel quantity adjusting device, with which a counter stop (41) coupled to the governor lever (15) can be brought into contact in the direction of motion of the fuel quantity adjusting device; a control lever (49) engages the stop lever (33) and is pivotable counter to a pullback force by means of the governor sleeve (13) about a stationary axis (28) between two stops (70, 71), and a displacement position occupied by the governor sleeve (13) pivots the stop (39) out of its working position in an overlap area of the counter stop (41) when the engine is not running or below an idling speed of the engine, the stop lever (33) including first and second lever arms (47, 45) that are pivotable about a pivot (69), and that, in the same direction of rotation, the control lever (49) engages said first lever arm (47), and a temperature-dependently controlled governor member (53) engages said second lever arm (45). 
     
     
       2. The speed governor as defined in claim 1, in which for changing the full-load fuel supply quantity the stop lever (33) that receives the adjustable stop (39) is adjustable as a function of the charge pressure of the engine in the direction of motion of the counter stop. 
     
     
       3. The speed governor as defined by claim 1, in which the first and second lever arms (47, 45) of the stop lever (33) are connected, fixed against relative rotation and in a positionally stabilized manner via a bolt (43), having two flattened sides located opposite on another. 
     
     
       4. The speed governor as defined by claim 1, in which the stop lever (33) is rotatably guided via the bolt (43) in a bore (46) disposed at a right angle to a longitudinal slot (36) in the wall of the lifting rod (35), and is thus connected to a charge-pressure-dependent actuator (37). 
     
     
       5. The speed governor as defined by claim 4, in which the stop lever (33) is maintained in contact with the control lever (49) via a spring element (51). 
     
     
       6. The speed governor as defined by claim 1, in which the stop lever (33) is rotatable around the pivot (69) fixed on the lifting rod and is connected to the lifting rod (35) integrally and via a bayonet-like catch formed by the interposition of a U-shaped intermediate part (83) on the lever arm (45). 
     
     
       7. The speed governor as defined by claim 1, in which the temperature-dependent governor member (53) that acts on the second lever arm (45) of the stop lever (33) has a bolt (55) that is adjustable between two stops by means of a temperature-dependent actuator (53). 
     
     
       8. The speed governor as defined by claim 7, in which the temperature dependent actuator is a compression spring with a memory effect. 
     
     
       9. The speed governor as defined by claim 7, in which the temperature dependent actuator is an expandable material. 
     
     
       10. The speed governor as defined by claim 7, in which one of the stops of the bolt (55) is a screw plug (61) that can be screwed from the outside into the housing of the fuel injection pump and whose insertion depth is adjustable by means of adjusting disks (63). 
     
     
       11. The speed governor as defined by claim 1, in which the stop (41) is embodied as an adjusting screw that is screwed, transversely to the direction of adjustment of the fuel quantity adjusting device, into a strap (21) that couples the fuel quantity adjusting device to the governor lever (15). 
     
     
       12. The speed governor as defined by claim 1, in which the adjustment travel of the stop lever (33), which can be executed by means of the temperature-dependent governor member (53), is shorter than the adjustment travel that can be executed by means of the control lever (49). 
     
     
       13. The speed governor as defined by claim 2, in which the adjustment travel of the stop lever (33), which can be executed by means of the temperature-dependent governor member (53), is shorter than the adjustment travel that can be executed by means of the control lever (49). 
     
     
       14. The speed governor as defined by claim 3, in which the adjustment travel of the stop lever (33), which can be executed by means of the temperature-dependent governor member (53), is shorter than the adjustment travel that can be executed by means of the control lever (49). 
     
     
       15. The speed governor as defined by claim 4, in which the adjustment travel of the stop lever (33), which can be executed by means of the temperature-dependent governor member (53), is shorter than the adjustment travel that can be executed by means of the control lever (49). 
     
     
       16. The speed governor as defined by claim 5, in which the adjustment travel of the stop lever (33), which can be executed by means of the temperature-dependent governor member (53), is shorter than the adjustment travel that can be executed by means of the control lever (49). 
     
     
       17. The speed governor as defined by claim 6, in which the adjustment travel of the stop lever (33), which can be executed by means of the temperature-dependent governor member (53), is shorter than the adjustment travel that can be executed by means of the control lever (49). 
     
     
       18. The speed governor as defined by claim 7, in which the adjustment travel of the stop lever (33), which can be executed by means of the temperaturedependent governor member (53), is shorter than the adjustment travel that can be executed by means of the control lever (49). 
     
     
       19. The speed governor as defined by claim 10, in which the screw plug (61) surrounds the bolt (55) and the actuator in a cuplike manner, and the adjusting disks (63) simultaneously form a variable stop for a collar on the bolt (55). 
     
     
       20. The speed governor as defined by claim 9, in which the expandable material (91) of the temperature-dependent actuator moves the collar bolt (55) via the insertion depth of the entire temperature-dependent governor member (53) into the housing (3) via a thread (93) between two faces (97) that are adjustable.